Performance Improvement of Binary Sensor-Based Statistical Space-Time Block Code Cooperative Diversity Using Limited Feedback


Eksim A., Çelebi M. E.

IETE TECHNICAL REVIEW, cilt.27, sa.1, ss.60-67, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 1
  • Basım Tarihi: 2010
  • Doi Numarası: 10.4103/0256-4602.58975
  • Dergi Adı: IETE TECHNICAL REVIEW
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.60-67
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

The statistical cooperative diversity, based on space-time block codes (statistical STBC cooperative -diversity) is proposed for binary sensors by several authors. Since Alamoutis code is the only orthogonal code which achieves full diversity and full rate for two sensors, it is used in their works, and their achievable diversity order is 2. Instead of using Alamoutis code, we use extended cooperative space-time block coding (ECBSTBC) which achieves full diversity which is shown analytically and full rate for an arbitrary number of sensors if a limited feedback is available at the active sensors. Another method to increase diversity in cooperative communications is sensor (relay) selection. However, the sensor selection method may lead to the selection of the same (near) sensor for transmission over a long period causing the energy hole problem in sensor networks. The ECBSTBC which utilizes every sensor in sight thus distributes the energy consumption among active sensors and alleviates the energy hole problem. In addition, it can be shown with detailed simulations that the ECBSTBC outperforms both the statistical STBC cooperative diversity and the sensor selection schemes.